package com.shiro.Config;

import at.pollux.thymeleaf.shiro.dialect.ShiroDialect;
import com.shiro.Dao.ShiroRealm;
import org.apache.shiro.authc.credential.CredentialsMatcher;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.mgt.DefaultWebSecurityManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.apache.shiro.mgt.SecurityManager;
import org.springframework.web.servlet.handler.SimpleMappingExceptionResolver;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Properties;

@Configuration
public class ShiroConfig {
    @Bean
    public ShiroFilterFactoryBean shirFilter(SecurityManager securityManager) {
        System.out.println("配置ShiroConfig.............");
        ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
        shiroFilterFactoryBean.setSecurityManager(securityManager);
        // 拦截器
        Map<String,String> filterChainDefinitionMap = new LinkedHashMap<String,String>();
        // 配置不会被拦截的链接，顺序判断，因为前端模板采用了thymeleaf，这里不能直接使用 ("/static/**", "anon")来配置匿名访问，必须配置到每个静态目录
        filterChainDefinitionMap.put("/css/**", "anon");
        filterChainDefinitionMap.put("/js/**", "anon");
        filterChainDefinitionMap.put("/img/**", "anon");
        // 开放登陆接口，不然第一次登陆时会有权限问题
        filterChainDefinitionMap.put("/login", "anon");
        // 配置退出过滤器，其中的具体的退出代码Shiro已经替我们实现了
        filterChainDefinitionMap.put("/logout", "logout");
        // 过滤链定义，从上向下顺序执行，一般将/**放在最为下边
        // authc：所有url都必须认证通过才可以访问；anon：所有url都都可以匿名访问
        filterChainDefinitionMap.put("/**", "authc");
        // 如果不设置默认会自动寻找Web工程根目录下的"/login.html"页面
        shiroFilterFactoryBean.setLoginUrl("/login");
        // 登录成功后要跳转的链接
        shiroFilterFactoryBean.setSuccessUrl("/index");
        // 未授权界面
        shiroFilterFactoryBean.setUnauthorizedUrl("/403");
        shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap);
        return shiroFilterFactoryBean;
    }

    /**
     * 凭证匹配器
     * （由于我们的密码校验交给Shiro的SimpleAuthenticationInfo进行处理了）
     * @return
     */
    @Bean
    public CredentialsMatcher hashedCredentialsMatcher(){
        HashedCredentialsMatcher hashedCredentialsMatcher = new HashedCredentialsMatcher();
        // 散列算法：这里使用MD5算法
        hashedCredentialsMatcher.setHashAlgorithmName("md5");
        // 散列的次数，比如散列两次，相当于md5(md5(""))
        hashedCredentialsMatcher.setHashIterations(2);
        return hashedCredentialsMatcher;
    }

    @Bean
    public ShiroRealm shiroRealm(){
        ShiroRealm shiroRealm = new ShiroRealm();
        shiroRealm.setCredentialsMatcher(hashedCredentialsMatcher());
        return shiroRealm;
    }

    @Bean
    public SecurityManager securityManager(){
        DefaultWebSecurityManager securityManager =  new DefaultWebSecurityManager();
        securityManager.setRealm(shiroRealm());
        return securityManager;
    }

    /**
     * 开启shiro aop注解支持
     * 使用代理方式;所以需要开启代码支持
     * @param securityManager
     * @return
     */
    @Bean
    public AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor(SecurityManager securityManager){
        AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor = new AuthorizationAttributeSourceAdvisor();
        authorizationAttributeSourceAdvisor.setSecurityManager(securityManager);
        return authorizationAttributeSourceAdvisor;
    }

    @Bean(name="simpleMappingExceptionResolver")
    public SimpleMappingExceptionResolver
    createSimpleMappingExceptionResolver() {
        SimpleMappingExceptionResolver r = new SimpleMappingExceptionResolver();
        Properties mappings = new Properties();
        mappings.setProperty("DatabaseException", "databaseError"); // 数据库异常处理
        mappings.setProperty("UnauthorizedException","/403");
        r.setExceptionMappings(mappings);   // None by default
        r.setDefaultErrorView("error");     // No default
        r.setExceptionAttribute("exception");   // Default is "exception"
        //r.setWarnLogCategory("example.MvcLogger");    // No default
        return r;
    }

    @Bean
    public ShiroDialect shiroDialect() {
        return new ShiroDialect();
    }
}